Created 'staging' branch

I created 'staging' branch in git.

As the name stated, this branch is to test new features before we deploy them at prayertimes.sg

       [Feature Branch]
              |
      (Develop new feature)
              |
              v
        git merge
              |
         [Staging Branch] ---------------------> [Staging Server]
              |                                     |
              | (Automatic deploy via Hatchbox)     |
              |                                     v
              |                           https://1jw9g.hatchboxapp.com/
              |
        git merge
              |
         [Main Branch] -------------------------> [Production Server]
                                                    |
                                                    v
                                          prayertimes.sg